twiggy
You are probably thinking about it by todays standards in America.
Yes, a spoiled American Teenager wouldnt be able to handle true married life. However, not all cultures and not all time periods are like America of today.
My Great Grandparents were engaged at 13 and were married at 15 and lived a beautiful Toradike life and raised a wonderful family.
In Israel at 15 Teenagers have so much more responsibilities than Teens in America its not even comparable!
My personal opinion is that children should remain children as long as possible because once you grow up you can never get your innocents back.